Pleistocene calcareous nannofossil stratigraphy for ODP Leg 177 (Atlantic sector of the Southern Ocean)

Author(s): Flores, José Abel; Marino, Maria
Author Affiliation(s): Primary:
Universidad de Salamanca, Departamento de Geología, Salamanca, Spain
University of Florida, United States
Universita di Bari, Italy
Volume Title: Southern Ocean Eocene-Pleistocene stratigraphies; insights from ocean drilling
Volume Author(s): Gersonde, Rainer, editor; Hodell, David A.
Source: Southern Ocean Eocene-Pleistocene stratigraphies; insights from ocean drilling, edited by Rainer Gersonde and David A. Hodell. Marine Micropaleontology, 45(3-4), p.191-224. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0377-8398 CODEN: MAMIDH
Note: In English. Includes appendix. 31 refs.; illus., incl. strat. cols., 8 tables, sketch maps
Summary: Seven Ocean Drilling Program (ODP) sites recovered during ODP Leg 177 in the Atlantic sector of the Southern Ocean were analyzed to study the Pleistocene calcareous nannofossil record. Calcareous nannofossil events previously described from intermediate and low latitudes were identified and calibrated with available geomagnetic and stable isotope stratigraphic data. In general, Pleistocene southern high latitude calcareous nannofossil events show synchronicity with those observed from warm and temperate latitudes. The first occurrence (FO) of Emiliania huxleyi and the last occurrence (LO) of Pseudoemiliania lacunosa are observed in marine isotope stages (MIS) 8 and 12, respectively. A reversal in abundance between Gephyrocapsa muellerae and E. huxleyi is observed at MIS 5. MIS 6 is characterized by an increase in G. muellerae and MIS 7 features a dramatic decrease in the proportion of Gephyrocapsa caribbeanica. This latter species began to increase its proportions from MIS 14 to 13. The LO of Reticulofenestra asanoi is observed within subchron C1r.1r and the FO of R. asanoi occurs at the top of C1r.2r. A re-entry of medium-sized Gephyrocapsa can be identified in some cores during subchron C1r.1n. The LO of large morphotypes of Gephyrocapsa is well correlated through the studied area, and occurs during the middle-low part of subchron C1r.2r, synchronous with other oceanic regions. The FO of Calcidiscus macintyrei and FO of medium-sized Gephyrocapsa occur in the studied area close to 1.6 Ma. Abstract Copyright (2002) Elsevier, B.V.
Year of Publication: 2002
Research Program: ODP Ocean Drilling Program
Key Words: 24 Surficial Geology, Quaternary Geology; Algae; Assemblages; Atlantic Ocean; Biostratigraphy; Calcidiscus macintyrei; Cenozoic; Coccolithophoraceae; Emiliania; Emiliania huxleyi; Extinction; First occurrence; Floral list; Gephyrocapsa; Gephyrocapsa caribbeanica; Gephyrocapsa muellerae; Leg 177; Lithostratigraphy; Marine environment; Marine sediments; Microfossils; Nannofossils; ODP Site 1088; ODP Site 1089; ODP Site 1090; ODP Site 1091; ODP Site 1092; ODP Site 1093; ODP Site 1094; Ocean Drilling Program; Plantae; Pleistocene; Pseudoemiliania lacunosa; Quaternary; Reticulofenestra asanoi; Sediments; South Atlantic; Southern Ocean; Taxonomy
Coordinates: S531049 S531049 E0050749 E0050749
S405611 S405611 E0095338 E0095338
Record ID: 2002063090
Copyright Information: GeoRef, Copyright 2017 American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands